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As the black hole spins, matter can escape in the form of narrow jets called collimated outflows.

High energy collisions of protons often result in production of collimated spray of particles, collected in what is termed as jets, from decay of ordinary quarks or gluons.

One possible signal would be a flash of light from a collimated light beam generated to propel light sails.

Seeing a collimated beam of light and controlling that, reflecting it, refracting it, making art.

But to reach this goal requires a major investment in the infrastructure needed to produce and collimate such a light beam.